Fasting blood glucose 5.1 mmol per liter blood glucose is in the normal range, normally the standard of fasting blood glucose is between 3.9 mmol per liter and 6.1 mmol per liter. Under normal circumstances, the breakdown and synthesis of sugar in the body are in dynamic balance and remain relatively constant. Blood glucose testing is one of the tests to determine diabetes. Clinically, the fasting blood glucose value and the blood glucose value 2 hours after meal are of reference significance. The normal blood glucose value for a person should be between 3.9 mmol/L and 6.1 mmol/L in the case of fasting, less than 7.8 mmol/L 2 hours after meal, and less than 11.1 mmol/L in the case of random. If higher than these values, patients are advised to control carbohydrate intake as well as high calorie and fatty foods. If the blood glucose value is too high, glucose-lowering drugs, such as glibenclamide, can be taken after a clear diagnosis under the guidance of a doctor. People with abnormal blood glucose should test their blood glucose value regularly. If the blood glucose value is too high, they should go to the hospital in time and take medication under the doctor’s guidance.